In this design a concrete pad called a “mud pad” is poured on the crawl space floor. This is essentially a concrete barrier meant to help control moisture in the crawl space. This is done several ways; with and with out a vapor barrier. The traditional mud pad is a poured concrete pad over a roughly graded dirt floor.

What is an open crawl space and why does it need to be “fixed”? A typical open crawl space has open foundation vents and an exposed or partially covered dirt floor. Open Crawl Space​This type of foundation construction is very common throughout the United States and Canada....